题目内容
某电场的分布如图所示,带箭头的实线为电场线,虚线为等势面。A、B、C三点的电场强度分别为EA、EB、EC,电势分别为
A、
B、
C,关于这三点的电场强度和电势 的关系,以下判断中正确的是( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241301407446896.png)
A.EA<EB,
B=
C
B.EA>EB,
A>
B
C.EA>EB,
A<
B
D.EA=EC,
B=
C
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130140650324.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130140650324.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130140650324.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241301407446896.png)
A.EA<EB,
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130140650324.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130140650324.png)
B.EA>EB,
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130140650324.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130140650324.png)
C.EA>EB,
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130140650324.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130140650324.png)
D.EA=EC,
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130140650324.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130140650324.png)
B
电场线越密的地方,电场强度越大,电场线越疏的地方,电场强度越小。所以
>
=
,沿着电场线的方向,电势在降低,所以
>
=
。所以选B。
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130141134388.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130141165394.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130141493391.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130141524385.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130141539380.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130141571389.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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